Text

04 - Industry - Wrtc Program Review
	ML23160A102
Person / Time
Issue date:	06/05/2023
From:	Ali Rezai; NRC/NRR/DNRL/NPHP
To:	;
References
	Download: ML23160A102 (1)
	v • d • e

w w w. e p r i. c o m Dan Patten, Energy Harbor (WRTC Chair)

June 14, 2023 Welding & Repair Technology Center (WRTC)

Industry / NRC Materials Programs Technical Information Exchange Public Meeting

2 WRTCs Areas of Interest

No reports submitted to NRC

No expected report submittals

Areas of interest since last meeting will be highlighted

Technical discussions with NRC are being planned for key topics and will also be highlighted Overview and significant Program updates since the last meeting

3 WRTC/ASME/Industry Meeting with NRC (March 7, 2023)

Session 1: Nuclear Regulatory Commission (NRC) staff held a public meeting with the Electric Power Research Institutes Welding and Repair Technology Center (EPRI-WRTC).

- Purpose of meeting was to have a technical exchange focusing on several ASME code cases with goal to gain a better understanding of the NRCs basis for the conditions and to help in future to reduce some conditions. (Examples)

Code Case N-847-1, Partial Excavation and Deposition of Weld Metal for Mitigation of Class 1 Items Code Case N-894, a new code case for repair of piping with thermal fatigue cracking Code Case N-818-1, Use of NDE and Fracture Mechanics for acceptance of Full Penetration Butt Welds in Lieu of Weld Repair, Class 1 and 2.

Code Case N-853-1, PWR Class 1 Primary Piping Alloy 600 Full Penetration Branch Connection Weld Metal Buildup for Material Susceptible to Primary Water Stress Corrosion Cracking,Section XI..

Session 2: Key Projects for Collaboration areas were discussed Weldability Threshold for Irradiated materials Effective Heat Input Spent Fuel Canister Repair and Cold Spray Repair Hardness Protocol for Temper Bead Welding

4 WRTC/ASME/Industry Meeting - Future Meetings Continue discussion/technical exchange focused on ASME code cases Conditionally approved, Disapproved, Area of optimization or clarification Include Code Case 752 - Risk Informed R&R Continue discussions on Key Projects for Collaboration Status of Additive Manufacturing Code Cases, and evaluations Goal to establish collaboration with Irradiated material weldability studies Continue discussion (as needed)

- Effective Heat Input

- Spent Fuel Canister Repair and Cold Spray Repair

- Hardness Protocol for Temper Bead Welding

5 WRTC Overview 8 Research Focus Areas Common research grouped together Addressing operating and future fleets

6 Performance Comparisons Between NiCrFe Variants WRTCs RFA 1: Material Weldability and Welding Alloy Development

- Focus on high Cr Nickle alloy filler metal development (Alloy 52 variants)

- New alloys and alternative suppliers are being evaluated.

- CNNP (China) supplied materials, Kobelco (Japan) supplied materials

- Goal to improved weldability and selection criteria for all applications (overlay, cavity, etc.)

- Guidance for implementation WRTCs RFA 2: Irradiated Materials Repair Solutions Welding challenges are being evaluated related to the high helium content generated in aged reactor internals Conventional and advance welding process under review on representative materials Weldability thresholds are being expanded based on effective heat input, helium content and welding process Identified as area of collaboration and further discussion with NRC 0.01 0.1 1

10 0.1 1

10 100 Effective Heat Input (KJ/cm)

Helium Concentration (appm)

JOG-GTAW-BM - No Cracking JOG-GTAW-BM - Cracking JNES-GTAW-BM - No Cracking JNES-GTAW-BM - Cracking JNES-GTAW-WM - No Cracking JNES-GTAW-WM - Cracking LBW-BM - No Cracking LBW-BM - Cracking LBW-WM - No Cracking LBW-WM - Cracking LBW - Remelt Trials - No Cracking LBW - Remelt Trials - Cracking JNES-GTAW-WM - GBD LBW-BM - GBD LBW - Remelt Trials - GBD

- Denotes single pass result He-Induced Cracking Threshold Plot: 304 SS

7 WRTCs RFA 3: Optimize Joining, Fabrication, and Repair Processes

- Cold Spray process is being evaluated for Spent Fuel Canisters and exploring additional areas where the process could be used for repair (Part of the ESCP program, and PNNL research collaboration).

Discussions planned in near future with NRC on this research area Alternative methods for measuring heat input (Effective Heat Input) are being used for crack sensitive materials and temper bead welding Discussions planned in near future with NRC on this research area

- Hardness drop criterion for temper bead

- Effective Heat input for temper bead Other areas in the RFA

- Adaptive Feedback welding being researched to control welding conditions through AI, and machine learning control Adaptive Feedback Welding Technology

8 WRTCs RFA 4: Repair Solutions for Structures Development of repair solutions for critical nuclear structures -

current focus on containment, spent fuel pool (SFP), and dry cask storage system (DCSS) structures Interface with EPRI Extended Storage Collaboration Program (ESCP)

New case for Repair & Replacement of canisters is planned for future discussion with NRC.

Dry Cask Storage (NRC, ML062200058)

WRTCs RFA 5; Small Bore Piping Issues Training material for understanding small bore piping issues, high cycle fatigue, and leak sealing.

Implementation guidance for Mechanical joints and fittings (Lokring)

High cycle fatigue testing of elbow mechanical fitting Under WRTCs RFA 6: Codes and Standards Publishes an Annual Report on status of Code changes, Code Cases, and Technical Issues Additional technical discussions with NRC are planned for;

Surface Stress Improvement Code Case

Code Case N-847 -

Code Case N-894 - WOL for fatigue

New Code Case for Repair and Mitigation of SFC

9 Under WRTCs RFA: 7 - Tactical Implementation of Repair Methods; WRTC Wiki has been developed as a hub for weld repair related information and WRTC program Provides information from the Weld Repair Handbook and other sources (Specific information may be difficult to locate in large documents)

Allows for quick navigation between content Links to training and workshops Links to events and Information exchange Developing Events Management Response Tool (EMRT) to support technical information search of for emerging issues, general information Developing Guidance documents and training tools Conducting Regional Training and developing Computer Based Training (CBTs)

Topics include; Repair and Replacement Training, Welding Personnel Introductory Training, Construction Code Training, Advanced Welding Process Training, Hands-on Welding, Friction Stir Welding, Repair of Buried Piping Training, Operational Leakage Workshop, Socket Weld Workshop, Temper Bead Welding Workshop Guidance Documents

Hardfacing Repairs (2022)- Updating Valve Repair Guideline, Repair of Cast Irons, Temper Bead Welding, Duplex Stainless Steels repairs, Repair and Replacement Program Implementation, Freeze Sealing Summaries of Common Degradation Methods

10 PM-HIP Scaled SMR Head and Valve body Under WRTCs RFA 8; Advance Manufacturing -

Development and Evaluation

- Supporting EPRI Advance Manufacturing Initiative (AM3) to

- Support of advance manufacturing methods including EB welding of thick section vessel component

- Supporting Powder Metallurgy manufacturing processes.

- Evaluating Additive methods of manufacturing

- Supporting Code Case development for additive materials.

- Additional technical discussions with NRC are planned for this RFA

- ASME Code progress and environmental testing Direct Energy Deposition Valve Body

11 TogetherShaping the Future of Energy'

ML23160A102

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